What are the specs for this Control Board?

The correct replacement for Tempstar model T4A442GKD200 — Diagnostic Module | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number T4A442GKD200 — Diagnostic Module | Ships Today.

Is this control board compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar Comfort Alert Control Board for T4A442GKD200 — Diagnostic Module | Ships Today

Name: Tempstar Comfort Alert Control Board for T4A442GKD200 — Diagnostic Module | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 165.00 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

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Overview

This is a genuine OEM Comfort Alert control board (part number 1177402) for the Tempstar T4A442GKD200 condensing unit. The Comfort Alert module is a compressor diagnostic and protection board that continuously monitors the compressor's voltage and current draw to detect faults such as locked rotor, open circuit, missing run capacitor, low or high line voltage, short cycling, and welded contactor conditions. It flashes coded LED alerts so a technician can diagnose the system quickly, and it helps protect the compressor from damaging operating conditions. When this board fails, you may see a system that won't run, intermittent compressor operation, no diagnostic LED activity, or false fault trips even when the compressor is healthy.

Specifications

Spec	Value
Part Number	1177402
Type	Comfort Alert Compressor Diagnostic Control Board
Brand	Tempstar
Function	Compressor monitoring & fault diagnostics (LED coded alerts)
Control Voltage	24 VAC
Fit	OEM Replacement

Compatibility

Designed as the factory diagnostic control board for the Tempstar T4A442GKD200 outdoor condensing unit. The same OEM part (1177402) is used across many ICP-family single-stage AC and heat pump models built under the Tempstar, Heil, Comfortmaker and Arcoaire brands that ship with the Comfort Alert diagnostics feature. Confirm your unit originally included a Comfort Alert module before replacing.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter before touching the board.
Access — Remove the condenser service panel to reach the electrical control compartment.
Document — Photograph every wire and terminal connection on the board before disconnecting anything.
Remove — Disconnect the sense and 24V leads, release the board from its mounting standoffs/clips, and lift it out.
Install — Mount the new 1177402 board, then reconnect each lead to the matching terminal exactly per your photo.
Test — Restore power, call for cooling, and confirm the board's status LED shows normal operation with no fault codes.

Signs You Need a Replacement

No diagnostic LED activity or a dead status light
Compressor won't run or cycles intermittently with no clear cause
False or persistent fault codes on a known-good compressor
Visible burn marks, corrosion, or scorched traces on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

Tempstar Comfort Alert Control B...

$165.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A442GKD200 — Diagnostic Module | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A442GKD200 — Diagnostic Module | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the control board on my Tempstar T4A442GKD200 — Diagnostic Module | Ships Today?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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